Presentation Transcript

CLASSIFICATION OF MALOCCLUSION :

INTRODUCTION :

INTRODUCTION OCCLUSION: The static relationship between occlusal surface of max and mand teeth or tooth analogues
MALOCCLUSION:. Any deviation from a physiologically acceptable contact of opposing dentitions.
CLASSIFICATION: the description of dentofacial deviations according to a common characteristic or norm.

NEED OF CLASSIFICATION :

ADAVNTAGES OF CLASSIFICATION :

TYPES OF MALOCCLUSION :

TYPES OF MALOCCLUSION INTRA ARCH INTER ARCH SKELETAL

INTRA ARCH MALOCCLUSION :

INTRA ARCH MALOCCLUSION Includes variation in individual tooth position or those affecting group of teeth within the same arch
INCLUDES:
Abnormal inclination( TIPPING)
Abnormal displacement
Spacing and crowding ‘WITHIN SAME
ARCH’

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Lischer’s modification of Angle’s classification :

Lischer’s modification of Angle’s classification Neutro-occlusion – Angle’s Class I
Disto-occlusion – Angle’s Class II
Mesio-occlusion – Angle’s Class III
Mesioversion – mesial to normal position
Distoversion – distal to normal position
Linguoversion – lingual to normal position
Labioversion – labial to normal position
Infraversion – inferior or away from the line of occlusion
Supraversion – superior or extended past the line of occlusion
Axiversion – axial inclination is wrong, tipped
Torsiversion – rotated on its long axis
Transversion – transposed or changes in the sequence of position

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Bennet’s classification Class I – abnormal position of one or more teeth due to local causes.
Class II – abnormal formation of a part/ whole of either arch due to developmental defect of bone.
Class III – abnormal relation between upper and lower arches and between either arch and facial contour and co-related abnormal formation of either arch.

Ackermann-Profitt classification :

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Alignment
Interarch alignment and symmetry assessed when seen in occlusal view.
Dental arch is classified as ideal/crowded/spaced
Profile
can be convex/straight/concave
Includes assessment of facial divergence ie. Anterior or posterior divergence.
Transverse relationships
Include transverse skeletal and dental relationships.
Buccal and palatal cross bites are noted.
Further classified as unilateral or bilateral.
Distinction made between skeletal and dental cross bites.

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Class
Sagittal relationship of teeth is assessed using Angle’s classification as Class I / II / III.
Distinction made between skeletal and dental malocclusions.
Overbite
Assessed in the vertical plane
Described as anterior open bite / posterior open bite / anterior deep bite / posterior collapsed bite.
Distinction made between skeletal and dental malocclusions.